Raise the minimum required version of PHPUnit to solve the compatibility issues with PHP 8.1

Author: ste93cry

composer.json

@@ -44,7 +44,7 @@
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "^0.12",
         "phpstan/phpstan-phpunit": "^0.12",
-        "phpunit/phpunit": "^8.5||^9.0",
+        "phpunit/phpunit": "^8.5.14||^9.0",
         "symfony/browser-kit": "^3.4.44||^4.4.20||^5.0.11",
         "symfony/cache": "^3.4.44||^4.4.20||^5.0.11",
         "symfony/dom-crawler": "^3.4.44||^4.4.20||^5.0.11",